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2018 ; 6
(ä): 74
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Video-Rate Bioluminescence Imaging of Degranulation of Mast Cells Attached to the
Extracellular Matrix
#MMPMID30042943
Yokawa S
; Suzuki T
; Hayashi A
; Inouye S
; Inoh Y
; Furuno T
Front Cell Dev Biol
2018[]; 6
(ä): 74
PMID30042943
show ga
Degranulation refers to the secretion of inflammatory mediators, such as
histamine, serotonin, and proteases, that are stored within the granules of mast
cells and that trigger allergic reactions. The amount of these released mediators
has been measured biochemically using cell mass. To investigate degranulation in
living single cells, fluorescence microscopy has traditionally been used to
observe the disappearance of granules and the appearance of these discharged
granules within the plasma membrane by membrane fusion and the movement of
granules inside the cells. Here, we developed a method of video-rate
bioluminescence imaging to directly detect degranulation from a single mast cell
by measuring luminescence activity derived from the enzymatic reaction between
Gaussia luciferase (GLase) and its substrate coelenterazine. The neuropeptide Y
(NPY), which was reported to colocalize with serotonin in the secretory granules,
fused to GLase (NPY-GLase) was efficiently expressed in rat basophilic leukemia
(RBL-2H3) cells, a mast-cell line, using a preferred human codon-optimized gene.
Bioluminescence imaging analysis of RBL-2H3 cells expressing NPY-GLase and
adhered on a glass-bottomed dish showed that the luminescence signals from the
resting cells were negligible, while the luminescence signals of the secreted
NPY-GLase were repeatedly detected after the addition of an antigen. In addition,
this imaging method was applicable for observing degranulation in RBL-2H3 cells
that adhered to the extracellular matrix (ECM). These results indicated that
video-rate bioluminescence imaging using GLase will be a useful tool for
detecting degranulation in single mast cells adhered to a variety of ECM
proteins.